/* =========================================================
   品牌档案 /culture/ —— page-about
   ========================================================= */

.page-about {
  --about-line: rgba(28, 23, 20, .22);
  --about-line-soft: rgba(28, 23, 20, .12);
}

/* ---------------- 首屏 ---------------- */

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-hero__lead h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(38px, 9vw, 92px);
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-hero__lead h1 span {
  display: block;
  color: var(--ag-red);
}

.page-about .about-hero__lede {
  margin-top: 18px;
  max-width: 60ch;
  color: var(--ink-soft);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-stat {
  padding: 15px 14px 17px;
  background:
    linear-gradient(180deg, rgba(231, 224, 212, .55), rgba(244, 239, 230, 0)),
    var(--cream);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: .04em;
  line-height: 1.1;
  color: var(--ink);
}

.page-about .about-stat--red .about-stat__num {
  color: var(--ag-red);
}

.page-about .about-stat--blue .about-stat__num {
  color: var(--cobalt);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gray);
}

/* ---------------- 通用栏目标题 ---------------- */

.page-about .about-head {
  max-width: 68ch;
}

.page-about .about-head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(28px, 5vw, 56px);
  line-height: 1.04;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-head p {
  margin: 14px 0 0;
  font-size: 17px;
  line-height: 1.9;
  color: var(--ink-soft);
}

/* ---------------- 编年轨道 ---------------- */

.page-about .chrono__banner {
  margin: 30px 0 34px;
  border: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .chrono__banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .chrono__list {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .chrono__list::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--ag-red), var(--gold) 48%, var(--cyan) 92%);
  opacity: .6;
}

.page-about .chrono__node {
  position: relative;
  padding: 0 0 28px 44px;
  outline: none;
}

.page-about .chrono__node:last-child {
  padding-bottom: 0;
}

.page-about .chrono__node::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  width: 11px;
  height: 11px;
  background: var(--cream);
  border: 2px solid var(--ag-red);
  transform: rotate(45deg);
  transition: background var(--ease), border-color var(--ease), transform var(--ease);
}

.page-about .chrono__node:hover::before,
.page-about .chrono__node:focus-visible::before {
  background: var(--ag-red);
  transform: rotate(45deg) scale(1.3);
}

.page-about .chrono__node:focus-visible {
  box-shadow: 0 0 0 2px var(--cobalt);
  border-radius: 2px;
}

.page-about .chrono__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--gold);
  transition: color var(--ease);
}

.page-about .chrono__node:hover .chrono__year,
.page-about .chrono__node:focus-visible .chrono__year {
  color: var(--ag-red);
}

.page-about .chrono__body h3 {
  margin: 5px 0 0;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .chrono__body p {
  margin: 8px 0 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------------- 流程 + 数字双栏 ---------------- */

.page-about .about-split {
  display: grid;
  gap: 36px;
}

.page-about .flow {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .flow__step:last-child {
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .flow__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .08em;
  line-height: 1.6;
  color: var(--ag-red);
}

.page-about .flow__step:nth-child(even) .flow__num {
  color: var(--cobalt);
}

.page-about .flow__step h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .flow__step p {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-aside__media {
  margin: 0 0 24px;
  border: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .about-aside__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-metrics {
  border-top: 1px solid var(--about-line);
}

.page-about .about-metric {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-metric__value {
  order: 1;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--ink);
}

.page-about .about-metric__key {
  order: 2;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gray);
}

/* ---------------- 赛区编务 ---------------- */

.page-about .about-zones {
  display: grid;
  gap: 30px;
  margin-top: 30px;
}

.page-about .about-zones__media {
  margin: 0;
  border: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .about-zones__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .zone-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .zone {
  padding: 15px 14px 16px;
  border-bottom: 1px solid var(--about-line-soft);
  border-left: 3px solid transparent;
  outline: none;
  transition: background var(--ease), border-color var(--ease);
}

.page-about .zone:hover,
.page-about .zone:focus-visible {
  background: var(--panel);
  border-left-color: var(--ag-red);
}

.page-about .zone:nth-child(even):hover,
.page-about .zone:nth-child(even):focus-visible {
  border-left-color: var(--cobalt);
}

.page-about .zone:focus-visible {
  box-shadow: inset 0 0 0 2px var(--cobalt);
}

.page-about .zone strong {
  display: block;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--ink);
}

.page-about .zone span {
  display: block;
  margin-top: 5px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray);
}

/* ---------------- 规则板 ---------------- */

.page-about .rules {
  display: grid;
  gap: 0;
  border: 1px solid var(--about-line);
}

.page-about .rules__lead {
  padding: 26px 22px;
  border-bottom: 1px solid var(--about-line);
  background:
    linear-gradient(135deg, rgba(217, 58, 43, .12), rgba(244, 239, 230, 0) 62%),
    var(--cream);
}

.page-about .rules__lead h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(26px, 4.6vw, 48px);
  line-height: 1.06;
  color: var(--ink);
}

.page-about .rules__lead p {
  margin: 14px 0 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-about .rules__layers {
  margin: 0;
  padding: 0;
  list-style: none;
  background:
    linear-gradient(180deg, rgba(29, 78, 216, .07), rgba(244, 239, 230, 0) 78%),
    var(--cream);
}

.page-about .rules__layers li {
  padding: 20px 22px;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .rules__layers li:first-child {
  border-top: 0;
}

.page-about .rules__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .rules__layers h3 {
  margin: 8px 0 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .rules__layers p {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------------- 引用场景 ---------------- */

.page-about .cited {
  display: grid;
  gap: 0;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .cited__item {
  position: relative;
  padding: 22px 0 22px 22px;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .cited__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  width: 4px;
  height: 24px;
  background: var(--gold);
}

.page-about .cited__item--red::before {
  background: var(--ag-red);
}

.page-about .cited__item--blue::before {
  background: var(--cobalt);
}

.page-about .cited__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 600;
  letter-spacing: .03em;
  line-height: 1;
  color: var(--ink);
}

.page-about .cited__item--red .cited__num {
  color: var(--crimson);
}

.page-about .cited__item--blue .cited__num {
  color: var(--cobalt);
}

.page-about .cited__item h3 {
  margin: 10px 0 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .cited__item p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-note {
  margin: 26px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-line-soft);
  font-size: 14px;
  line-height: 1.85;
  color: var(--gray);
}

/* ---------------- 收尾 ---------------- */

.page-about .about-next {
  display: grid;
  gap: 22px;
  padding: 26px 0 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-next .lede {
  max-width: 60ch;
  color: var(--ink-soft);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------------- 响应式 ---------------- */

@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .chrono__node {
    display: grid;
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 26px;
    padding-left: 48px;
  }

  .page-about .chrono__node::before {
    left: 8px;
  }

  .page-about .chrono__list::before {
    left: 13px;
  }

  .page-about .zone-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .zone:nth-child(odd) {
    border-right: 1px solid var(--about-line-soft);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .rules {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .rules__lead {
    padding: 40px 36px;
    border-bottom: 0;
    border-right: 1px solid var(--about-line);
  }

  .page-about .cited {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 34px;
  }

  .page-about .about-next {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    gap: 40px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-zones {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .zone-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .zone:nth-child(odd) {
    border-right: 0;
  }

  .page-about .zone:not(:nth-child(3n)) {
    border-right: 1px solid var(--about-line-soft);
  }
}
</main>